Basics of AC Servo
A "servo system" is a generic term used for an automatic control system. In other words a mechanism which adjusts itself during continued operation through feedback. Servo control is a closed loop control system for electric motors. The servo system uses a sensor to sense motor position/speed. Servo control has a feedback circuit which changes the drive power going to motor according the control input signals and the feedback signals from sensors Three basic types of servo motors are used in modern servo systems: ac servo motors, based on induction motor designs; dc servo motors, based on dc motor designs; and ac brush less servo motors, based on synchronous motor designs. AC servomotors are typically permanent magnet synchronous motors that often have low torque-to-inertia ratios for high acceleration ratings. AC servomotors use integral encoders, integral resolvers, and integral tachometers for feedback signals. Integral encoders contain attached encoders for angu...